Motorola Astro Digitalport Saber Basic 68p81076c05 Manual

Perform the following procedures in the
sequence indicated.
NOTE
Some of the following screens may vary depending
upon the radio under test and the version of radio
service software you are using. Refer to your radio
service software userÕs guide.
C. Reference Oscillator Alignment
Adjustment of the reference oscillator is critical for
proper radio operation. Improper adjustment will result
not only in poor operation, but also in a misaligned
radio that will interfere with other users operating on...

D. Transmit Power Alignment
NOTE
¥ All power measurements are to be made at the
antenna port.
¥ The transmitter power setting keeps the radiat-
ed power at or below the level specified in the
exclusionary clause for low power devices of
IEEE Standard C95.1-1991.
1. From the SERVICE MENU, pressF2to select the
TRANSMITTER ALIGNMENT MENU.
2. Press F3to select the TRANSMIT POWER align-
ment screen. The screen will indicate the transmit
frequencies to be used. See Figure 5.3. Press Tab(or Enteror Return) to...

E. Transmit Deviation Balance 
(Compensation) Alignment
Compensation alignment balances the modulation
sensitivity of the VCO and reference modulation (syn-
thesizer low-frequency port) lines. The compensation
algorithm is critical to the operation of signalling
schemes that have very-low-frequency components
(for example, DPL) and could result in distorted wave-
forms if improperly adjusted. 
1. From the SERVICE MENU, pressF2to select the
TRANSMITTER ALIGNMENT MENU.
2. Press F4to select the TRANSMIT...

F. Transmit Deviation Limit Alignment
IMPORTANT NOTE
Put the radio in the RF test mode and scroll to the
ASTRO test environment, indicated by ÒASTÓ on
the display (refer to the Performance Checks sec-
tion for details). All other deviation values are
derived from the ASTRO test environment mode
transmit deviation limit.
1. From the SERVICE MENU, pressF2to select the
TRANSMITTER ALIGNMENT MENU.
2. Press F5to select the TRANSMIT DEVIATION
LIMIT alignment screen. The screen will indicate
the transmit...

G. Front-End Filter Alignment (VHF/UHF Only)
NOTE
This procedure is only required for tuning the front-
end filter varactors in the VHF and UHF models.
The 800MHz models utilize a fixed front-end filter.
1. From the SERVICE MENU, pressF3to select the
RECEIVER ALIGNMENT MENU.
2. Press F2to select the FRONT END FILTER
ALIGNMENT screen. The screen will indicate the
receive frequencies at which the filter is to be
aligned. See Figure 8.
3. Press Tab(or Enteror Return) to select a fre-
quency field.4. Set the...

18
NOTES 

A. Disassembly
(Refer to the following diagrams and the exploded
view diagram located in the back of this manual.)
1.Turn off the radioby rotating the on/off/volume
control fully counterclockwise until you hear a
click. Remove the accessory connector cover or
any accessory connected to the radio before
beginning disassembly.
2. Remove the batteryfrom the baseplate on the
bottom of the radio housing by pushing the spring-
loaded battery latch toward the top of the radio,
and sliding the battery away from...

5. Gently push the center bottom edge of the front
shield assembly and lift it away from the bottom
of the chassis. If necessary, use a small slotted
screwdriver to disengage the two retaining clips
near the bottom outer edges. Next, pull the front
shield assembly out from under the plastic top
panel. Be careful not to pull against the flexible cir-
cuits connecting to the controller board. 
6. Disconnect the display flexible circuit (Models II
and III only) and the speaker/microphone flexi-
ble...

8. Remove the center shieldfrom the chassis by
inserting a thin slotted screwdriver between each
of five center-shield release clips and the corre-
sponding chassis-retaining tabs.
Once freed from the chassis at the five release
points, the center shield can be removed and the
RF board can be removed from the chassis.
B. Servicing Major Subassemblies
Refer to the exploded view diagram at the back of
this manual before attempting further disassembly or
repair.
1. Baseplate
¥ All repairs to the baseplate...

¥ When the knob is properly inserted, the arms
of the switch bracket will snap into position
(approximately 0.2 inches apart), the knob will
not be loose in the switch bracket, and the
bracket will hold the switch firmly against the
inside of the top control panel. If this is not the
case, replace the switch bracket.
C. Reassembly
Reassemble the radio in the reverse order of 
disassembly, referring to Servicing Major Subassem-
blies (paragraph B) and making certain:
1. that the protruding block that...